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// Copyright (c) Authors of Clover
//
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Apache License, Version 2.0
// which accompanies this distribution, and is available at
// http://www.apache.org/licenses/LICENSE-2.0
package clovisor
import (
"bytes"
"errors"
"fmt"
"strconv"
"strings"
core_v1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/remotecommand"
)
type ClovisorK8s struct {
client *kubernetes.Clientset
config *rest.Config
}
type monitoring_info_t struct {
namespace string
svc_name string
pod_name string
container_name string
protocols []string
port_num uint32
pod_ip string
}
var DEFAULT_NAMESPACE = "default"
var SUPPORTED_PROTOCOLS = [...]string {"tcp", "http"}
func K8s_client_init(nodeName string) (*ClovisorK8s, error) {
config, err := rest.InClusterConfig()
if err != nil {
fmt.Println(err.Error())
return nil, err
}
client, err := kubernetes.NewForConfig(config)
if err != nil {
fmt.Println(err.Error())
return nil, err
}
return &ClovisorK8s{
client: client,
config: config,
}, nil
}
func (client *ClovisorK8s) Get_monitoring_info(nodeName string) (map[string]*monitoring_info_t,
error) {
labels_list, err := get_cfg_labels(nodeName)
if err != nil {
fmt.Printf("Error getting cfg labels: %v\n", err)
return nil, err
}
mon_info_map := client.get_monitoring_pods(nodeName, labels_list)
if mon_info_map == nil {
return nil, errors.New("monitoring info empty")
}
return mon_info_map, nil
}
func (client *ClovisorK8s) getPodsForSvc(svc *core_v1.Service,
namespace string) (*core_v1.PodList, error) {
set := labels.Set(svc.Spec.Selector)
//label := strings.Split(set.AsSelector().String(), ",")[0]
//fmt.Printf("Trying to get pods for service %v with label %v from %v\n", svc.GetName(), label, set.AsSelector().String())
listOptions := metav1.ListOptions{LabelSelector: set.AsSelector().String()}
//listOptions := metav1.ListOptions{LabelSelector: label}
return client.client.CoreV1().Pods(namespace).List(listOptions)
}
func (client *ClovisorK8s) get_monitoring_pods(nodeName string,
labels_list []string) (map[string]*monitoring_info_t) {
/*
* Three cases:
* 1.) no configured namespaces, monitoring all pods in default namesapce
* 2.) if any config only has namespace, monitoring all pods in namespace
* 3.) label is configured, only monitor pods with that label
*/
var namespace string
ns_svc_map := make(map[string][]*core_v1.ServiceList)
monitoring_info := make(map[string]*monitoring_info_t)
if len(labels_list) == 0 {
// TODO(s3wong): set it to 'default'
//namespace = "linux-foundation-gke"
namespace = "default"
if svcs_list, err :=
client.client.CoreV1().Services(namespace).List(metav1.ListOptions{});
err != nil {
fmt.Printf("Error fetching service list for namespace %s\n",
namespace)
return nil
} else {
/*
if _, ok := ns_svc_map[namespace]; !ok {
ns_svc_map[namespace] = []*core_v1.ServiceList{}
}
*/
ns_svc_map[namespace] = append(ns_svc_map[namespace], svcs_list)
}
} else {
for _, label_str := range labels_list {
var label_selector string
namespace, key, value := parse_label_cfg(label_str)
if len(namespace) == 0 {
fmt.Printf("Error in config: %s not a valid config\n", label_str)
continue
}
if len(key) == 0 {
fmt.Printf("Namespace only config for %s\n", namespace)
} else {
label_selector = fmt.Sprintf("%s=%s", key, value)
}
if svc_list, err :=
client.client.CoreV1().Services(namespace).List(metav1.ListOptions{
LabelSelector: label_selector,
}); err != nil {
fmt.Printf("Error listing services with label %v:%v:%v - %v\n",
key, value, namespace, err.Error())
continue
} else {
if _, ok := ns_svc_map[namespace]; !ok {
ns_svc_map[namespace] = []*core_v1.ServiceList{}
}
ns_svc_map[namespace] = append(ns_svc_map[namespace], svc_list)
}
}
}
for ns, svc_slice := range ns_svc_map {
for _, svc_list_ := range svc_slice {
for _, svc := range svc_list_.Items {
if ns == "default" && svc.GetName() == "kubernetes" {
continue
}
//fmt.Printf("Looking for supported protocols for service %v:%v\n", ns, svc.GetName())
//var svc_port_map = map[string]core_v1.ServicePort{}
var svc_port_map = map[string][]string{}
for _, svc_port := range svc.Spec.Ports {
if len(svc_port.Name) > 0 {
svc_protos := strings.Split(svc_port.Name, "-")
for _, proto := range svc_protos {
if err := loadProtoParser(proto, false); err == nil {
for _, sp := range SUPPORTED_PROTOCOLS {
if strings.Contains(proto, sp) {
target_port := svc_port.TargetPort.String()
svc_port_map[target_port] = append(svc_port_map[target_port], proto)
}
}
} else {
fmt.Printf("Unsupported protocol: %v\n", proto)
}
}
}
}
if len(svc_port_map) == 0 {
fmt.Printf("Found no port with supported protocol for %v:%v\n", ns, svc.GetName())
continue
} else {
fmt.Printf("svc_port_map for service %v is %v\n", svc.GetName(), svc_port_map)
}
//fmt.Printf("Fetching pods for namespace %v service: %v\n", ns, svc.GetName())
pod_list, err := client.getPodsForSvc(&svc, ns)
if err != nil {
fmt.Print("Error fetching pods for %v:%v [%v]\n", ns, svc.GetName(), err)
continue
}
/*
labelSet := labels.Set(svc.Spec.Selector)
pod_list, err := client.client.CoreV1().Pods(ns).List(metav1.ListOptions{})
if err != nil {
fmt.Print("Error fetching pods for %v:%v [%v]\n", ns, svc.GetName(), err)
continue
}
*/
for _, pod := range pod_list.Items {
if pod.Spec.NodeName == nodeName {
for _, container := range pod.Spec.Containers {
var port_num uint32
var tp_string string
for _, port := range container.Ports {
port_num = uint32(port.ContainerPort)
tp_string = strconv.Itoa(int(port_num))
if _, in := svc_port_map[tp_string]; !in {
continue
}
pod_name := pod.GetName()
monitoring_info[pod_name] = &(monitoring_info_t{})
monitoring_info[pod_name].namespace = ns
monitoring_info[pod_name].svc_name = svc.GetName()
monitoring_info[pod_name].pod_name = pod_name
monitoring_info[pod_name].container_name = container.Name
monitoring_info[pod_name].port_num = port_num
monitoring_info[pod_name].protocols = svc_port_map[tp_string]
monitoring_info[pod_name].pod_ip = pod.Status.PodIP
}
}
}
}
}
}
}
return monitoring_info
}
func (client *ClovisorK8s) exec_command(command string,
monitoring_info *monitoring_info_t) (string, error) {
// Following code based on:
// https://stackoverflow.com/questions/43314689/example-of-exec-in-k8ss-pod-by-using-go-client
// https://github.com/a4abhishek/Client-Go-Examples/blob/master/exec_to_pod/exec_to_pod.go
exec_req := client.client.CoreV1().RESTClient().Post().
Resource("pods").
Name(monitoring_info.pod_name).
Namespace(monitoring_info.namespace).
SubResource("exec")
scheme := runtime.NewScheme()
if err := core_v1.AddToScheme(scheme); err != nil {
fmt.Printf("Error in exec pods: %v\n", err.Error())
return "", err
}
parameterCodec := runtime.NewParameterCodec(scheme)
exec_req.VersionedParams(&core_v1.PodExecOptions{
Command: strings.Fields(command),
Container: monitoring_info.container_name,
Stdin: false,
Stdout: true,
Stderr: true,
TTY: false,
}, parameterCodec)
exec, err := remotecommand.NewSPDYExecutor(client.config, "POST", exec_req.URL())
if err != nil {
fmt.Printf("Error in remotecommand exec: %v\n", err.Error())
return "", err
}
var stdout, stderr bytes.Buffer
err = exec.Stream(remotecommand.StreamOptions{
Stdin: nil,
Stdout: &stdout,
Stderr: &stderr,
Tty: false,
})
if err != nil {
fmt.Printf("Error in exec stream: %v\n", err.Error())
return "", err
}
stdout_no_newline := strings.TrimSuffix(stdout.String(), "\n")
return stdout_no_newline, nil
}
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